Plugs - NGK or Autolite?

Tom_5.0

New Member
Jun 6, 2019
2
0
1
37
UK
Morning all,

I am currently running NGK FR5 plugs but they don't run good at all. I want to put some Autolites in but what does everyone recommend?
AP104, Resistor 25, AP25 Platinum or APP104??

I have Holley Systemax heads and intake

Thanks,
 
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Tom_5.0

New Member
Jun 6, 2019
2
0
1
37
UK
Thanks guys. I am in the UK so limited to what we can get here. Looks like a choice between Autolite 25 is the only copper plug available to me so i'll give those a go!
 

2000xp8

SN Certified Technician
Aug 8, 2003
6,959
1,065
194
NJ
Try and explain what the plugs don't run right at all means.
Minor changes such as spark plugs usually don't cause major issues.
 
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